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기출문제 풀어보고 있는데 답은 있는데 해설이 없어서요 ,,, 

해설좀 부탁드려요 ,,,

B: As far as I know, he's busy ___ his trip

a) plan

b) to plan

c) planning

d) being planned 

이문제는 왜 to v는 안될까요 ,,

2. Most of the oil ___ into the city is used 

for creating energy to run industrial facilities.

a) put 

b) to put 

c) putting 

d) having put

이거는 답이 a 인데 감을 못잡겠어요,,, 

3. The amateur dancer was so nerves that she

couldn't stand but at the ___ moment she stood 

in front of audiences, she relaxed and gave performance

a) right 

b) just

c) very

d) even

이런 문제는 외워야하나요 ,,